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In response to a request from Charles River Park Properties, a study was made of possible hazardous conditions at the 50 Staniford Street Office Building (SIC-9199), Boston, Massachusetts. Particular attention was given to polychlorinated-biphenyls (1336363) (PCBs), polychlorinated dibenzofurans (PCDFs), and polychlorinated dibenzo-p- dioxins (PCDDs) in air and on surfaces. A fire had occurred in an electrical transformer containing Aroclor-1254 (11097691), in the upper basement. Ventilation carried soot throughout the upper basement area and possibly to other building areas. Sixteen air samples analyzed for PCBs indicated residual air concentrations in the building ranging from below the level of detection to 0.46 micrograms/cubic meter. Twelve samples analyzed for PCDF/PCDDs gave levels ranging from 0.003 to 1.7 picograms/cubic meter. Of 339 wipe samples, 32 percent failed to detect PCBs, 67 percent detected measurable levels of PCBs less than 25 micrograms/square meter (microg/m2), and 1 percent contained PCBs at levels ranging from 25 to less than 50microg/m2. The highest of 58 samples taken on interior heating, ventilation and air conditioning surfaces exceeded 50microg/m2. Two samples exceeded the 1 nanogram/square meter (ng/m2) guideline for PCDF/PCDDs. One was 1.2ng/m2 on a wood paneled wall which has since been removed. The other was 2.7ng/m2 on the floor of the transformer vault which has since been encapsulated. The author concludes that the building is acceptable for occupancy.